In a medium bowl, combine oat flour, protein powder, and chocolate chips (if using).
In a separate small bowl, whisk together peanut butter, maple syrup, almond milk, and vanilla extract until smooth.
Pour the wet ingredients into the dry ingredients and mix until a dough forms. If the dough is too dry, add a little more almond milk, one teaspoon at a time. If too wet, add a little more oat flour.
Roll the dough into bite-sized balls.
Chill in the refrigerator for at least 15 minutes before serving.
Notes
Store in an airtight container in the refrigerator for up to 5 days.